Nearly 50 per cent of the total 590 COVID-19 patients found so far in Mumbai are from four administrative wards of the city's civic body. The latest infographic released by the Brihanmumbai Municipal Corporation (BMC) suggests that 282 of the 590 positive cases were detected in D, E, G-South and K- West wards. 241 containment zones have been created in the city, where at least one or more positive or suspected case of COVID-19 found. Restrictions have been put on the movement of people in these zones to avoid spread of the virus. 57 staff members including nurses were quarantined at 2 civic-run hospitals in Mumbai on Wednesday after a patient each tested positive there.<br />'' <br />'' Meanwhile, BMC would be using the NSCI stadium in Worli as an observation facility for people who may have come into contact with coronavirus patients.<br />'' <br />'' The city police recovered around 57,500 surgical masks worth Rs 17.25 lakh from Byculla in Mumbai and arrested one person in this connection. The property cell of Mumbai crime branch seized the masks, which were stocked for sale at a higher price.<br />''  <br />